Spatial variation in female fertility related to interactions with flower consumers and pathogens in a forest metapopulation ofPrimula sieboldii

Antagonistic biological interactions with flower consumers and pathogens may influence reproductive success of flowering plants, affecting population dynamics and natural selection for floral traits. However, ecological and evolutionary consequences of the interactions may depend on both spatial and temporal patterns of the interactions. In a forest metapopulation ofPrimula sieboldii E. Morren, an endangered clonal plant species, we measured between-subpopulation patterns of seed sets and interactions with an influential flower consumer, a rove beetle,Eusphalerum bosatsu Watanabe, and a specific smut fungal pathogen,Urocystis tranzschelina (Lavrov) Zundel (Ustilaginales), for three years. Mean female fertility (seed set per flower) for individual subpopulations fluctuated moderately among years but was highly variable within each year among the five subpopulations studied. In two subpopulations, the impact ofEusphalerum beetle, was sufficiently large to result in almost complete failure in seed production over eight years including the three study and five previous preliminary observation years. In the two other subpopulations, seed set failure was caused by infection by the smut fungus. Infected capsules which constitute 10–30% of the capsules produced in the subpopulations were filled with ustilospores instead of seeds. In the subpopulation that escaped flower damage byEusphalerum beetles and smut fungal infection, seed sets of both pin and thrum flowers were much higher than in the other subpopulations. The spatial restriction of individual antagonistic agents to a part of subpopulations suggest that dispersal of the agents, as well as the mode of spatial subdivision of the plant population would be important for determining the overall effects of antagonistic interactions on plant performances at the metapopulation level.     

干旱胁迫对不同品种绿豆种子萌发的影响

以4个品种绿豆种子为材料,用不同浓度的 PEG -6000溶液模拟干旱胁迫进行处理,测定发芽势、发芽率、胚芽长、胚根长及超氧化物歧化酶（SOD）、过氧化氢酶（CAT）、过氧化物酶（POD）活性,探究干旱胁迫对绿豆种子萌发的影响。结果表明,随着 PEG 浓度的增加,4种绿豆种子的发芽势、发芽率、胚芽长、胚根长呈下降趋势。当 PEG 浓度为5-10%时,超氧化物歧化酶、过氧化氢酶、过氧化物酶活性均呈小幅上升趋势;当 PEG 浓度为15%时,各酶活性急剧上升到最高值,且各酶活力的升高幅度有所不同;当 PEG 浓度为20%时,各酶活性急剧下降。     

最优搜索机制下寻找最优插入-删除种子

空位种子极大地提高了生物分子序列比对的灵敏度,但不适合大量存在插入和删除字符的序列。在空位种子的基础上,提出了带插入-删除的生物序列比对种子,进一步提高了生物序列比对的效率。实验表明,采用最优搜索算法可以有效地在给定约束条件下寻找到最优的插入-删除种子,并且插入-删除种子比同长度的最优空位种子具有更高的生物序列比对敏感度。     

对于中国种子产业适度规模经营的战略思考

种子的质量就是企业的生命线,经营规模是企业获得利润的根本保证,而种子生产基地的选择、建立,种子的生产、收购等诸多环节决定着中国种子企业的生存、发展和强大,目前中国种业企业在制种方面面临生产基地建设、统一标准管理、良种收购入库等方面许多制约因素。从转换土地流转机制的角度分析我国实行种业适度规模经营的可行性,以期探讨中国种子企业做大、做强的有效途径。     

苦瓜种子生活力四唑测定值与发芽率间的相关性

通过分别测定苦瓜种子的发芽率与生活力 ,计算得出二者的相关系数为r=0 .9397,建立发芽率依生活力的回归方程为 y=1.4 873+ 0 .95 90x。应用回归方程依据生活力四唑测定值估算发芽率理论值 ,与相应的发芽结果作一致性假设测验 ,二者高度一致     

不同活力水稻种子萌发特性比较研究

:以陆两优63、金优402、株两优02等三个杂交组合为材料,以它们各自的亲本为对照,在不同浸种时间、老化处理下,对其发芽率、发芽势、脱氢酶活性和种子生活力等进行了研究。结果表明:杂交水稻种子萌发所需最佳浸种时间比常规水稻种子短、种子活力及脱氢酶活性高于常规水稻,但耐老化能力低于常规水稻种子。     

基于态势分析法探讨福建省杂交稻种业的发展对策

运用SW OT分析法对福建省杂交水稻种子产业进行态势分析,系统阐明福建省发展杂交水稻种子产业具备的优势和存在的问题,面临的机遇及应对的挑战,并进一步提出新形势下福建省杂交水稻种子产业发展的对策建议:(1)着重发展杂交水稻制种产业;(2)重视种子法制建设;(3)加快种子管理体制改革;(4)加强种子质量管理体系建设;(5)实行积极的产业发展政策;(6)重视种子的科研育种工作;(7)发挥种子协会作用,加强行业自律;(8)努力拓宽杂交水稻种子国际市场;(9)协助组建国际型种业集团。     

营养液和赤霉素对芽苗菜生长的影响

以萝卜、荞麦、香椿种子为材料,研究了营养液和赤霉素(GA)对芽苗菜生长的影响.结果表明,营养液和赤霉素处理后的芽苗菜不仅能增加整齐度,而且可明显提高产量;用营养液浸种能使萝卜、荞麦、香椿的单盘鲜重分别增加6.6%,20.3%和27.3%;用10—50mg/L赤霉素处理以上三者的种子,能使其增产7.8%—26.2%.     

几种禾本科牧草种子萌发期耐盐性测定

以哲里木盟地区常见的几种禾本科牧草种子为试验材料，观测了它们在不同浓度盐液处理下的萌发率，结果表明，苏丹草与饲用种草在种子萌发期表现出较好的耐性，其种子萌发率在各浓度盐浓下均显著高于其它牧草。     

蛋白质电泳法与田间种植测定法鉴定玉米杂交种纯度对比试验

应用蛋白质电泳法与田间种植法分别测定了21份玉米杂交种纯度,结果表明两者相关系数达极显著水平（r=0.8575）,说明玉米蛋白质法是一种快速、可靠的鉴定种子纯度方法。